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Single
Stage
Furnace
Input
Winter
Design
Temp
°F (oc)
Table
14 - Maximum
Allowable
Exposed
Vent Lengths
Insulation
Table - Ft. / M
Maximum Length of Uninsulated and Insulated Vent Pipe-Ft (M)
Pipe
Length in
Ft. &M
No Insulation
Pipe
Diameter
- in. (mm)
11/252121/236
4
(38)
(
)
(64)
(
)
(102)
3/8-in, (9.5 mm) Insulation
Pipe Diameter - in, (mm)
1 1/2
2 1/2
4
(38)
(21)
(64)
(36)
(102)
1/2-in.
(12.7
mm)
Insulation
Pipe
Diameter
- in. (mm)
1 1/2
21/2
4
(38)
(21)
(64)
(36)
(102)
Ft.
N/A
25
99
89
78
N/A
25
110
233
265
N/A
25
110
235
229
20 (-1 O)
M
Ft.
0 (-20)
M
100,000
Ft.
-20
(-30)
M
Ft.
-40
(-40)
M
120,000
Ft.
M
Ft.
M
Ft.
M
Ft.
M
20 (-1 O)
0 (-20)
-20
(-30)
-40
(-40)
Ft.
20 (-1 O)
M
Ft.
0 (-20)
M
140,000
Ft.
-20
(-30)
M
Ft.
-40
(-40)
M
N/A
7.6
30.2
27.1
23.8
N/A
7.6
33.5
71.0
80.8
N/A
7.6
33.5
71.6
69.8
N/A
25
55
46
33
N/A
25
110
145
117
N/A
25
110
173
140
N/A
7.6
16.8
14.0
10.1
N/A
7.6
33.5
44.2
35.7
N/A
7.6
33.5
52.7
42.7
N/A
25
34
24
11
N/A
25
110
103
79
N/A
25
110
124
97
N/A
7.6
10.4
7.3
3.4
N/A
7.6
33.5
31.4
24.1
N/A
7.6
33.5
37.8
29.6
N/A
23
20
11
0
N/A
25
95
77
55
N/A
25
110
94
70
N/A
7.0
6.1
3.4
0.0
N/A
7.6
29.0
23.5
16.8
N/A
7.6
33.5
28.7
21.3
N/A
N/A
15
99
86
N/A
N/A
15
1 O0
219
N/A
N/A
15
1 O0
250
N/A
N/A
4.6
30.2
26.2
N/A
N/A
4.6
30.5
66.8
N/A
N/A
4.6
30.5
76.2
N/A
N/A
15
51
38
N/A
N/A
15
1 O0
130
N/A
N/A
15
1 O0
156
N/A
N/A
4.6
15.5
11.6
N/A
N/A
4.6
30.5
39.6
N/A
N/A
4.6
30.5
47.5
N/A
N/A
15
28
14
N/A
N/A
15
1 O0
88
N/A
N/A
15
1 O0
108
N/A
N/A
4.6
8.5
4.3
N/A
N/A
4.6
30.5
26.8
N/A
N/A
4.6
30.5
32.9
N/A
N/A
15
14
0
N/A
N/A
15
85
62
N/A
N/A
15
1 O0
79
N/A
N/A
4.6
4.3
0.0
N/A
N/A
4.6
25.9
18.9
N/A
N/A
4.6
30.5
24.1
N/A
N/A
10
90
99
N/A
N/A
10
90
210
N/A
N/A
10
90
210
N/A
N/A
3.0
27.4
30.2
N/A
N/A
3.0
27.4
64.0
N/A
N/A
3.0
27.4
64.0
N/A
N/A
10
61
47
N/A
N/A
10
90
153
N/A
N/A
10
90
183
N/A
N/A
3.0
18.6
14.3
N/A
N/A
3.0
27.4
46.6
N/A
N/A
3.0
27.4
55.8
N/A
N/A
10
35
21
N/A
N/A
10
90
104
N/A
N/A
10
90
128
N/A
N/A
3.0
10.7
6.4
N/A
N/A
3.0
27.4
31.7
N/A
N/A
3.0
27.4
39.0
N/A
N/A
10
20
NA
N/A
N/A
10
90
75
N/A
N/A
10
90
94
N/A
N/A
3.0
6.1
NA
N/A
N/A
3.0
27.4
22.9
N/A
N/A
3.0
27.4
28.7
43
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